Recoil brake



May 12, 1925.

' F. R. WALLAC E ET AL moon. BRAKE Filed Sept. 6, 1924 II/Ill] 7 a m a ma W WS .Rwd r r e M M F M Patented May 12, 1925.

UNITED STATES-PATENT OFFICE.

FRANK R. WALLACE, or PHILADELPHIA, PENN YLVANIA, AND LEROY TABOR,

or RIVERTON, NEW JERSEY.

RECOIL BRAKE.

Application filed September To all whom it may concern:

lie it known that we,- FRANK It. WALLACE,

a citizen of the United States, residing at Philadelphia, in the countyof Philadelphia \and State of Pennsylvania, and LEROY fiilanon, acitizen of the United States, re-

{Qiding at Itiverton, in thecounty of Burlington and State of NewJersey, have jointly invented a new and useful Improvement in RecoilBrakes, of which the following is a specification.

, Another object of the present invention is to utilize insuch a devicea change of pressure on two friction surfaces, to cause the same tocheck the recoil of a spring. Another object of the'invention is toprovide a recoil brake, especially adapted to satisfactorily control therebound of the spring of a vehicle so that the riding quality of thelatter is improved.

Other objects of the present invention will'appear from the followingdescription at the end of which the invention will be claimed b'uttheinvention willv be first de-. scribed in connection with the embodimentof it chosen, for illustration in the accompanying drawings forming parthereof and Figure 1 is a sideviewillustrating an embodiment of theinvention in application to partsof a vehicle. I

Fig. 2 is a sectional view taken on the line 22,0f Fig.3.

Fig. 3 is s; sectional view taken on; the line 33 of Fig. 2, and 7 Fig.4 illustrates a modification.

In the drawings 1 and 2 are vehicle frame and axle elements and 3 is asupporting spring inerpolsedbetween the two. 4 and 5 are congentrio casthe fixed casing. This brake band is shown as of the form of a splitring and when the device is not in use it may be of diameter 'apn-opriate for free turning movement in s of which one, 4, is" fixed toone of the vehicleelements'l and of e, 1924. Serial 1T0. 736,211. a

the casing t. 9 is a "retracting spring, shown as a coil spring, and itis attached at one end to one end of the} brake band as by means of theconpling 10, and at the other end. the spring -9 is attached to thecasing 4, as shown, by means-of the split drum .11. Thereis on thegiovable casing 5 a post or projection 12 a apted to push on the end ofthe brake band 7, or, more accurately, on the end, shown as beveled, ofa fitting 13 provided on the endof the brake band. Externally the casing5 is shown as of the form of a double flanged pulley and on this pulleyface works a band 14, one end 15 of-which is secured to the casing 5,and the other 16 of which is secured-to the axle element 2.:fAs shownthe casing 5 is provided with a hub 17 turnable on the post 6, and thefpost 6 is shown as provided with a collar 18 by means of whichthecasing 4 is secured to the frame element 1. v

In use the parts are so adjusted thatthe' spring 9 is under sometension, and this is accomplished by properly proportioning the lengthof the strap or band 14 when the spring is under. what may be callednormal lead; When in the operation of the vehicle the spring 3 iscompressed to ward the frame 1, the s rirg 9 may-shift 3.5 the brakeband 7 and with it the casing 5 in'counter clockwise direction in Fig.2, but at the instant of recoil of thespring 3 in starting to, assume tsnormal position as shown in'Fig. 1,-the strap 14, pullin on the casing5-in' clockwise direction in Flg. 2, causes the post.or pin 12 pushin onthe end of the brake'band to" expand t e brake band diametrically, thusexerting an ine stantaneous increase of pressure between the linin 8'a'nd the internal'wall of the" fixed casing 4, and this increase inpressure, of course, increases the braking action of the device becauseit increases thefriotion between the lining and casing i. The result isthat the recoil of the spring 3 is checked at the instant of'itsoccurrence so that the frame element 1 is not thrown upward andgoodriding qualities are at taine d, As the spring 3 assumes its nor- 9 malposition the spring 9 operates to re-position the brake band 7 andrewind the strap 14. I In the modification shown in Fig. 4, theconnection between the turnable element a 5% end the axle 2, does notwrap around the run portion of the element 5, but is facially connectedtherewith, and for the purpose of explanation {the element 5-is shown asprovided ,withan arm. 14 connected by a link, rigid strep-or the like14" tothe 'axle 2. The effective leverae therefor'e variesaccording tothe engu er positions into art 5* turns and: this variation be evaded ofto efl ect variation in the degree of application of pressure andfriction" with regard to .the' relative positions of the parts 1, and 2.

It will be obvious' to those skilled -inthe art to which the inventionrelates that modifications may be made in details of coristructionandarrangement without departing from the'vspirit of the-invention whichand a supporting spring interposed between the .two of concentriccasings of which the inner one is fixed in respect to one of saidvehicle elements and of which the vouter one is turnable, an internalbrake bend provided 'exte1'i1al1y-,-xvit11 brake lining and arranged forco-operatlon with the inner surface of the fixed casing, 21 retractinspring attached to one end. of the brake band and at the other endattached. to the fixed casing a post or projection on 'the outer movablecasing adapted to push on the other end of the brakeband, and a strapconnected to the other vehicle element and with the exterior of theouter turnable casing.

21 A recoil brake'coniprising the combination with vehicle frame andaxleelements and tfrsupporting sprlng interposed between the two ofconcentric casings of which the inner. one is fixed in respect to one ofsaid vehicle elements and of which the outer one for eovop'era-tion withthe inner surface of i s turn,able, an internal brake band arrangedthefixed cesing, a retracting spring attached I to one end'of the brakeband'and at the other end attached to the fixed casing, 3e post orprojection on the outer movable casing adapted, to pushonUtheother endof the brakes band, and a strap connected to the other vehicle elementand with the exterior of the outer turnable casing. I

FRANK R. WALLACE LEROY TABOR.

